Finding the Fourth Proportional to 51.50, 71.06 and 42.72

Step by Step Solution

1. Step 1: Write the proportion equation
   51.50 : 71.06 = 42.72 : x
2. Step 2: Convert to fraction form
   51.50/71.06 = 42.72/x
3. Step 3: Cross multiply
   51.50x = 71.06 × 42.72
4. Step 4: Simplify right side
   51.50x = 3,035.68
5. Step 5: Solve for x
   x = 3,035.68/51.50
6. Step 6: Final answer
   x = 58.95